...that leave the wearer with the silhouette they had when it was removed.

Balloons on the chest and airbags on the butt to produce a remarkably light set of cushions on both ends; shoving plush-stuffing into the gloves to turn your hands into a pair of pillowy paws; maybe even just pumping the whole thing full of a malleable medium to make yourself big and round.

Of course, when you put it back on, it's like you never took it off; every change can be reversed to any degree... but only if you want it to be.

After all, some of us like the thought of life with a pair of impossibly-huge tits.